Nezu Kaichirō (根津 嘉一郎, August 8, 1860 – January 4, 1940) was a Japanese businessman, national politician and philanthropist.

Nezu was elected as a member of the House of Representatives in the National Diet in 1904 and won three subsequent reelections.

In 1905 Nezu became President of Tobu Railway and successfully helped to grow the company to one of the largest private rail operators in the Kanto region.

[2] Accompanying Shibusawa Eiichi on a trade mission to the United States in 1909, Nezu was inspired by American industrialists' enthusiasm for civic and philanthropic activities.

On his return to Japan Nezu founded and donated to a number of new educational and cultural initiatives including Musashi Junior and Senior High School.